A TRAIN TRAVELLING FROM POINT A TO POINT B SETS OFF TRAVELLING AT 110MPH. AT THE SAME TIME ANOTHER TRAIN SETS OFF TRAVELLING AT 85MPH FROM POINT B TO POINT A. HOW LONG WILL IT BE BEFORE THE TWO TRAINS PASS EACH OTHER? WELL, JUDGING BY THE STATE OF THE BRITISH RAIL SYSTEM, I'D SAY . . . SOME TIME NEXT THURSDAY.